Test & measurement
certifications which can be applied to customer- specific products worldwide:
Worldwide: IECEx International Electrotechnical Commission System for use in explosive atmospheres
Europe: ATEX: Atmosphères Explosibles
United Kingdom: UKCA United Kingdom Conformity Assessed
Russia: EAC Eurasian Conformity
There are also customer-specific authorisations for:
North America: FM Approved Certification for property damage prevention
North America: UL Underwriters Laboratories
Canada: CSA Canadian Standards Association
Korea: KCs Korea Certification Safety
All explosion-proof products made by KELLER
are recognisable by their specific labelling. This labelling features a key containing, among other things, the following information for gas explosion-proof products:
Symbol Ex for ATEX Ignition protection type (example: ia) Gas group IIA, IIB or IIC Temperature class (example: T4-T6) Device protection level (example: Ga) Licensing office Licence number
X for special conditions for safe use, described in more detail in the manuals.
EXpLoSIoN-pRooF pRodUCTS IN USE Products that are suitable for potentially explosive environments have a very wide field of use. KELLER has been producing explosion-proof pressure measurement technology since 1988. As a result of this invaluable experience, KELLER’s certified products are recognised across many sectors. The following four examples illustrate known situations from everyday life which all share one basic task. In all applications, the level, fill level or flow rate of a container is being measured and monitored on the basis of the pressure. This common task entails a wide variety of dangers in potentially explosive environments:
AUToMoTIvE INdUSTRy: painting robots When atomised in the spray nozzle, mists can produce ignitable mixtures.
Aviation industry: Liquids logistics of de-icing machines De-icing is performed with a liquid formed from at least 50 per cent glycol, which is highly flammable, plus water.
oIL INdUSTRy: Monitoring the fill level at petrol stations There is a risk at petrol stations that an electric spark could cause the gaseous atmosphere to explode.
ChEMICAL INdUSTRy: Monitoring of chemical distribution Warehouses belonging to chemical manufacturers and distributors contain numerous different chemical containers holding all manner of different explosive and harmful contents.
MEASURINg ANd TRANSMITTINg If the products are being used in difficult-to- reachplaces, the measured data cannot always be processed on site. In cases such as this, KELLER also offers remote transmission units which forward the measured values to a server or the cloud. The recorded and measured data is lastly retrieved and evaluated via a customer application or via KELLER’s own KOLIBRI Cloud portal. Remote transmission units, such as the Box
ARC1-SB made by KELLER, are in and of themselves not explosion-proof. Modules used in potentially explosive environments must therefore, as a matter of necessity, be installed outside of the explosive atmosphere. Remote transmission units for certified explosion-proof products contain safety barriers that limit the electrical power delivered to the connected intrinsically safe product. Ignition is prevented from occurring by this barrier and the required explosion protection is achieved.
EXpLoSIoN pRoTECTIoN oF ThE FUTURE KELLER is currently developing a new type of radio transmission unit which communicates over LoRaWAN or NB-IoT networks (Internet of Things) and can also be installed within potentially explosive environments. This development will make explosion protection even safer, while simplifying the installation of pressure measurement technology in hazardous areas.
KELLER
Remote transmission with LoRaWAN or NB-IoT networks
keller-druck.com
Remote transmission unit with data logger
Instrumentation Monthly November 2021
25
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